Legend:

On 3 vs. 4 BOINC instances, I've always gotten good performance with 4 instances, except for this problem (which appeared when one of my VMs got trashed and I needed to recreate it; the default ACPI option these days appears to be "on").

10

11

BTW, I've also noticed that the host OS does not cleanly shutdown if ACPI is DISabled, irrespective of the clocksource parameter. It just hangs at the "Ubuntu" five-dots screen.